### Function: SetPlayerProximityFunction(spawn, distance, in_range_function, leaving_range_function) **Description:** The Spawn (NPC) will be notified of a Player entering in range or leaving range. **Parameters:** - `spawn` (Spawn) - Spawn object representing `spawn`. - `distance` (int32) - Distance `distance`. - `in_range_function` (int32) - Distance `in_range_function`. - `leaving_range_function` (int32) - Distance `leaving_range_function`. **Returns:** None. **Example:** ```lua -- From SpawnScripts/Antonica/adistressedmerchant.lua function spawn(NPC) SetPlayerProximityFunction(NPC, 15, "InRange") end ```